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1.
Orcs and Goblins, and related creatures (including Space Orks, Gretchin, Hobgoblins, etc.). It's apparently exclusive to the Games Workshop range of games.

If Orcs really existed, this term would probably be considered racist (especially since some Orcs, the Black Orcs, do not have green skins in Warhammer).
The fortress was besieged by a ravening horde of Greenskins.
Andyによって 2004年05月01日(土)
 
2.
Dope , Weed , Smoking herbs, Druggie
Guy:bro
guy2:dude you seriously need a green skin get some dope
jacktheripperbroによって 2010年04月16日(金)
 
3.
soldiers of the former KGB, now KG used to be, troop. Currently it refers to men of Communist China' PLA, Peoples' Liberation Army. Along with wedgehead and popeye, there are the main characteristics of those barbaric commies.
Dare ChinComm (Chinese Communist) dispatch its AK-rattling greenskins trying to wade the TaiWan strait, we, the Army of TaiWan, are gonna fuckin' waste'em 'cuz we have more bullets'n they have greenskins, whose bodies, when bloated, look more uglier.
Dingによって 2003年09月29日(月)